rA:Radial load on bearing A, N {kgf} F rB:Radial load on bearing B, N {kgf} F1, F2:Radial load on shaft, N {kgf} If directions of radial load differ, the vector sum of each respective load must be determined. A23 Bearing Load Calculation Fig. Chain / belt loads Chain or belt type f b Vbelt Timing belt Flat belt (w / tension pulley)